Used to determine spectrum loading
State of loading for the crane as a whole.
|State of loading||Nominal load spectrum factor, Kp||Descriptive definition|
|Q1 Light||0.5||Cranes that hoist the safe working load very rarely and normally light loads|
|Cranes that hoist the safe working load fairly frequently ang normally moderate loads|
|Q3 Heavy||0.8||Cranes that hoist the safe working load frequently ang normally heavy loads|
|Q4 Very Heavy||1||Cranes that a normally loaded close to safe working load|
Load spectrum factor can be calculated using the following method.
P1 - load corresponding to cycle C1
Pmax - rated load
C1 , C2 , etc. - No. of cycles which occur at individual lifted loads P1 ,P2 , etc.
Ct - total No. of cycles